He is popular, but he is not good at love

"Why the hell am I so happy that she likes me?!"
Stunning looks. Genius intellect. A young ace with 5 years of service, Yuji Maki is considered to be the ideal department manager. His nickname? "The obsidian prince."
He's never dated or confessed love to anyone in his life, and has never had a time where he's worried about women. That is, until he starts to feel something about Ida, his junior at work... who he previously tried to reject...?
However, even as he experiences the feeling of love, the fact that he's a total blockhead keeps him from realizing it. Instead, he continues to lose his composure around Ida over and over...
In this strange love story, he is the heroine...?!